Taken from wikipedia: The Green Hornet Strikes Again! (1941) is a Universal movie serial based on the The Green Hornet radio series by George W. Trendle. It's a sequel to the earlier, 1940 serial The Green Hornet. This was Universal's 117th serial (the 49th with sound) of the 137 the studio produced. The plot involves racketeering and is unusual for a film serial in having mostly stand alone episodes instead of a continuous story (although this was also the case for the original Green Hornet serial).